Herb Whole plant / Aerial parts (全草 quán cǎo)

Yi Mu Cao

Chinese motherwort · 益母草

Leonurus japonicus Houtt. · Herba Leonuri

Also known as: Kun Cao (坤草)

Yi Mu Cao (Chinese motherwort) plant

Images shown are for educational purposes only

Yi Mu Cao, or Chinese motherwort, is one of the most important herbs in Chinese medicine for women's health. Its Chinese name literally means "beneficial herb for mothers," reflecting centuries of use for menstrual irregularity, period pain, and recovery after childbirth. It also promotes urination to reduce swelling and can help clear mild skin conditions linked to Blood Heat.

Category Blood-invigorating and stasis-dispelling herbs (活血化瘀药)
Therapeutic focus Menstrual Health Postpartum recovery Women's Health Fluid Retention and Edema Skin Health

TCM Properties

Temperature

Slightly Cool

Taste

Acrid / Pungent (辛 xīn), Bitter (苦 kǔ)

Channels entered

Heart, Liver, Urinary Bladder

Parts used

Whole plant / Aerial parts (全草 quán cǎo)

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Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Herb Does

Every herb has a specific set of actions — here's what Yi Mu Cao does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Yi Mu Cao is primarily used to support these areas of health:

Menstrual Health Postpartum recovery Women's Health Fluid Retention and Edema Skin Health

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Yi Mu Cao performs to restore balance in the body:

Invigorates Blood and Regulates Menstruation Invigorates Blood and Dispels Stasis Promotes Urination and Reduces Edema Clears Heat and Resolves Toxicity

How these actions work

'Invigorates Blood and regulates menstruation' means Yi Mu Cao actively promotes Blood circulation, especially through the uterus and pelvic area. Its acrid taste disperses stagnation while its bitter taste drives Blood downward and outward. This is why it is considered the foremost herb for menstrual disorders caused by Blood stasis, including painful periods, absent periods, and incomplete discharge of lochia (postpartum bleeding). Classical texts call it a "holy herb for Blood" (血家之圣药) because it moves old stagnant Blood without damaging new, healthy Blood.

'Dispels Blood stasis' refers to its ability to break up and clear accumulated old Blood. When Blood stops moving properly, it can cause sharp, fixed pain, dark clots during menstruation, or masses. Yi Mu Cao's combined acrid-dispersing and bitter-draining nature makes it effective for dissolving these stagnant accumulations. This action also extends to traumatic injuries where bruising and internal Blood stasis cause pain.

'Promotes urination and reduces edema' means the herb helps the body eliminate excess fluid through the urinary system. This action is linked to its entry into the Urinary Bladder channel. It is particularly useful when edema (swelling) coexists with Blood stasis, a combination frequently seen in kidney conditions. Modern clinical practice commonly uses it for acute and chronic nephritis with edema.

'Clears Heat and resolves toxins' reflects the herb's slightly cool nature working in the Blood level. It can address skin conditions like rashes, itching, boils, and abscesses where Heat and toxins have entered the Blood. It is used both internally and as a topical wash for sores and carbuncles.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Yi Mu Cao is used to help correct these specific patterns.

Why Yi Mu Cao addresses this pattern

Yi Mu Cao is acrid (dispersing), bitter (draining), and slightly cool, entering the Liver and Heart channels that govern Blood. Its acrid nature opens and moves stagnant Blood, while its bitter nature drives downward to expel accumulated stasis. This dual action directly addresses the core pathomechanism of Blood Stasis, where Blood fails to circulate freely and accumulates, causing fixed pain and clotting. As classical sources describe, it "moves stagnant Blood without damaging new Blood" (行血而不伤新血), making it especially suitable for Blood Stasis in the uterus and lower abdomen.

A practitioner would look for one or more of these signs

Painful Menstruation

Menstrual pain with dark clots, pain relieved after clots pass

Amenorrhea

Absent periods due to Blood stasis obstruction

Postmenstrual Bleeding

Prolonged postpartum lochia with abdominal pain

Abdominal Pain

Fixed, stabbing lower abdominal pain

Commonly Used For

These are conditions where Yi Mu Cao is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Blood Stasis

TCM Interpretation

In TCM, painful menstruation (dysmenorrhea) is most often understood as Blood failing to flow smoothly through the uterus. When Blood becomes stagnant in the lower abdomen, it obstructs the channels and vessels, producing sharp, cramping pain that typically worsens before or at the onset of the period. Key signs of the Blood Stasis pattern include dark, clotted menstrual blood, pain that improves once clots are passed, and a purple or dusky tongue. The Liver, which governs the smooth flow of Blood and Qi throughout the body, is the primary organ system involved.

Why Yi Mu Cao Helps

Yi Mu Cao directly enters the Liver channel and the Blood level, where its acrid taste disperses accumulated stasis and its bitter taste drives stagnant Blood downward and outward through the uterus. Its slightly cool nature prevents it from generating additional Heat during the inflammatory process of menstruation. As the classical text says, it "moves old Blood without injuring new Blood," making it gentle enough for regular menstrual use while still being powerful enough to break up clots and relieve pain. Modern research confirms it stimulates uterine contractions, which helps expel stagnant blood and clots.

Also commonly used for

Amenorrhea

From Blood stasis obstructing the uterus

Postmenstrual Bleeding

Persistent postpartum lochia from uterine Blood stasis

Blood In Urine

From Blood Heat or Blood stasis

Skin Rashes

Hot, itchy skin eruptions from Blood Heat

Boils

Abscesses and carbuncles with swelling and toxins

Endometriosis

Blood stasis pattern with severe menstrual pain

Herb Properties

Every herb has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Slightly Cool

Taste

Acrid / Pungent (辛 xīn), Bitter (苦 kǔ)

Channels Entered

Heart Liver Urinary Bladder

Parts Used

Whole plant / Aerial parts (全草 quán cǎo)

Dosage & Preparation

These are general dosage guidelines for Yi Mu Cao — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

9-30g (dried herb); 12-40g (fresh herb)

Maximum dosage

Up to 60g under practitioner supervision for acute conditions. Exceeding 60-90g per day risks toxicity symptoms including dizziness, limb numbness, blood pressure drop, and potential kidney damage.

Dosage notes

Use lower doses (9-15g) for mild menstrual irregularity, promoting circulation, and reducing mild edema. Use higher doses (15-30g) for more stubborn Blood stasis conditions such as amenorrhea, severe postpartum blood retention, or significant edema. Fresh herb (12-40g) may be preferred when available, as the active alkaloid content is significantly higher in fresh material compared to stored dried herb. For external use (skin rashes, sores), the herb can be decocted for washing or the fresh juice applied topically without strict dose limits. Do not use continuously for extended periods, especially at higher doses, due to the risk of cumulative kidney stress. Treatment courses should be limited and monitored.

Preparation

No special decoction handling required. Yi Mu Cao is decocted normally with other herbs. Fresh herb may be juiced directly for acute conditions (a traditional method mentioned in classical texts for postpartum emergencies and topical applications).

Processing Methods

In TCM, the same herb can be prepared in different ways to change its effects — here's how processing alters what Yi Mu Cao does

Processing method

The dried herb segments are mixed with yellow rice wine (huáng jiǔ), allowed to absorb the wine, then stir-fried over gentle heat until dry. Standard ratio: 15kg wine per 100kg herb.

How it changes properties

Wine processing enhances the herb's ability to invigorate Blood, dispel stasis, and relieve menstrual pain. Wine is warm in nature and has an ascending, dispersing quality that strengthens the herb's Blood-moving action and helps guide it through the channels. The slightly cool nature of the raw herb is somewhat moderated.

When to use this form

Preferred when the primary goal is treating Blood stasis menstrual pain, amenorrhea, or postpartum stasis. The wine-processed form has a stronger Blood-invigorating effect than the raw herb, making it the form of choice for stubborn Blood stasis conditions.

Common Herb Pairs

These ingredients are traditionally combined with Yi Mu Cao for enhanced therapeutic effect

Dang Gui
Dang Gui Yi Mu Cao 9-15g : Dang Gui 6-10g (approximately 3:2)

Yi Mu Cao invigorates Blood and dispels stasis, while Dang Gui nourishes and tonifies Blood. Together they move stagnant Blood while simultaneously replenishing it, preventing the Blood-moving action from depleting the body's Blood reserves. This pair embodies the principle of "dispelling stasis without injuring the upright."

When to use: Postpartum recovery with lochia retention and Blood deficiency, or menstrual irregularity with both stasis and underlying Blood deficiency.

Xiang Fu
Xiang Fu 1:1 (typically 10-15g each)

Yi Mu Cao moves Blood stasis while Xiang Fu moves Liver Qi stagnation. Since Qi stagnation often underlies or accompanies Blood stasis (Qi is the commander of Blood), this pair addresses both the Qi and Blood aspects simultaneously, providing stronger pain relief and menstrual regulation than either herb alone.

When to use: Qi stagnation and Blood stasis pattern with premenstrual abdominal distension, menstrual pain, irregular periods, or postpartum abdominal pain with emotional irritability.

Ji Xue Teng
Ji Xue Teng Yi Mu Cao 10-15g : Ji Xue Teng 10-15g (1:1)

Yi Mu Cao activates Blood and dispels stasis, while Ji Xue Teng (Spatholobus) both moves Blood and nourishes it. The combination provides robust Blood invigoration with a supplementing quality, making it gentler than pairing Yi Mu Cao with purely stasis-breaking herbs.

When to use: Menstrual irregularity, painful periods, or amenorrhea where Blood stasis is accompanied by underlying Blood deficiency, especially in women with a pale complexion or fatigue.

Yan Hu Suo
Yan Hu Suo Yi Mu Cao 15g : Yan Hu Suo 6-10g (approximately 2:1)

Yi Mu Cao invigorates Blood in the uterus while Yan Hu Suo (Corydalis) powerfully moves both Qi and Blood to stop pain. Together they provide strong analgesic and stasis-dispelling effects, specifically targeting menstrual and abdominal pain from Blood stasis.

When to use: Severe dysmenorrhea with sharp, fixed pain and dark clotted menstrual blood, or postpartum abdominal pain from retained stasis.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Ze Lan
Yi Mu Cao vs Ze Lan

Both Yi Mu Cao and Ze Lan (Lycopus, Herba Lycopi) invigorate Blood and promote urination, and both are used for menstrual disorders and edema. However, Yi Mu Cao is stronger at invigorating Blood, has a broader range of gynecological applications, and also clears Heat and resolves toxins. Ze Lan is milder in its Blood-moving action and has a warmer nature, making it more suitable for patients who cannot tolerate Yi Mu Cao's coolness, or when a gentler Blood-moving effect is needed.

Tao Ren
Yi Mu Cao vs Tao Ren

Both invigorate Blood and dispel stasis. Tao Ren (Peach kernel) is stronger at breaking up established Blood stasis and fixed masses, and it also moistens the Intestines to relieve constipation. Yi Mu Cao has the additional benefits of promoting urination and clearing Heat-toxins, and is more specifically targeted at uterine and menstrual Blood stasis. Yi Mu Cao is slightly cool while Tao Ren is neutral, so Yi Mu Cao is preferred when Blood stasis has a Heat component.

Hong Hua
Yi Mu Cao vs Hong Hua

Both are primary Blood-invigorating herbs commonly used for menstrual disorders. Hong Hua (Safflower) is warm in nature and more focused on moving Blood and unblocking channels for generalized Blood stasis and pain throughout the body. Yi Mu Cao is slightly cool and has particular affinity for the uterus, plus it additionally promotes urination and clears toxins. For menstrual stasis with Heat signs, Yi Mu Cao is preferred; for cold-type Blood stasis or widespread body pain, Hong Hua may be more suitable.

Identity & Adulterants

Related species and common adulterations to be aware of when sourcing Yi Mu Cao

Yi Mu Cao (Leonurus japonicus) has historically been confused with several related species: 1. Leonurus sibiricus (Siberian motherwort): For decades, L. japonicus was misidentified as L. sibiricus in much of the botanical and pharmacological literature. The correct nomenclature was clarified by Harley and Paton in 2001. True L. sibiricus is a different species native to Siberia and Mongolia with very low leonurine content, making it pharmacologically inferior. 2. White-flowered Yi Mu Cao (Leonurus japonicus f. niveus): A white-flowered form used as a local substitute in some provinces (Jiangsu, Anhui, Fujian, Guangdong, etc.). Classical texts note that 'the white-flowered kind is not the same' and is considered less effective. 3. Zan Cai (錾菜, Leonurus pseudomacranthus): Used as a substitute in northern provinces (Hebei, Henan, Shanxi, Shandong, etc.). It has white flowers and different leaf morphology. 4. Leonurus cardiaca (European motherwort): Sometimes confused in Western herbal commerce, but HPLC analysis has confirmed it contains no leonurine whatsoever, making it pharmacologically distinct from the Chinese species.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any herb.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Yi Mu Cao

Slightly toxic

Yi Mu Cao contains alkaloids including leonurine (益母草碱) and stachydrine (水苏碱), which are responsible for both its therapeutic effects and its toxicity at high doses. Within the standard dosage range of 9-30g, the herb is generally safe. However, at excessive doses (reported above 60-90g in a single day), toxicity symptoms can occur: dizziness, fatigue, chest tightness, numbness in the limbs, profuse sweating, and a drop in blood pressure. In severe cases, paralysis of the lower limbs, respiratory depression, and circulatory collapse have been reported. Modern research has identified dose-dependent kidney toxicity as the most clinically significant concern. The damage primarily affects the renal medulla, manifesting as interstitial fibrosis, capillary dilation, and renal tubular atrophy. This kidney damage is mostly reversible with cessation of the herb and is strongly correlated with dosage, making proper dose control the key to safe use. Animal studies have also shown potential liver toxicity (hepatocyte vacuolization) with prolonged high-dose administration. Controlling dosage and duration of use, and avoiding the herb in patients with pre-existing kidney or liver disease, are essential safety measures.

Contraindications

Situations where Yi Mu Cao should not be used or requires extra caution

Avoid

Pregnancy: Yi Mu Cao strongly promotes blood circulation and has a demonstrated ergot-like uterotonic effect that causes uterine contractions, increasing the risk of miscarriage or premature labor.

Avoid

Active heavy menstrual bleeding (menorrhagia) or uterine hemorrhage (Blood collapse / 血崩): the herb's blood-moving properties can worsen excessive bleeding.

Caution

Blood deficiency without stasis: in patients who are Blood-deficient with pale complexion, fatigue, and scanty pale menses, using this strongly blood-moving herb without Blood-nourishing support can further deplete Blood and worsen the condition.

Caution

Yin deficiency with insufficient Blood: classical sources warn against using Yi Mu Cao when there is 'Blood deficiency and a frail constitution, or Liver deficiency with dilated pupils' (肝虚血少，瞳仁散大者).

Caution

Pre-existing kidney disease or impaired renal function: modern research has identified a dose-dependent risk of renal tubular damage, primarily affecting the renal medulla, particularly with prolonged or high-dose use.

Caution

Spleen and Stomach deficiency with loose stools: the herb is bitter, acrid, and slightly cold, which can further injure a weak digestive system. Classical texts note it should not be used when the 'Spleen and Stomach are not substantial and the Large Intestine is not firm.'

Caution

During menstruation in women with normal or heavy flow: the herb can increase menstrual volume and prolong bleeding time due to its anti-platelet aggregation effects.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Contraindicated during pregnancy. Yi Mu Cao has a well-documented ergot-like uterotonic effect: its primary alkaloid leonurine stimulates uterine smooth muscle, increasing contraction strength and frequency. This can increase the risk of miscarriage in early pregnancy and premature labor in later stages. The Chinese Pharmacopoeia explicitly states that Yi Mu Cao is prohibited for use by pregnant women (孕妇禁用). This is consistent with classical warnings and the herb's fundamental action of strongly moving Blood and dispelling stasis. Interestingly, an animal developmental toxicity study of isolated leonurine at high doses (up to 2000 mg/kg) found no significant teratogenicity, but the whole herb contains multiple active compounds that act synergistically on the uterus, and clinical safety in human pregnancy has not been established.

Breastfeeding

Use with caution during breastfeeding. While Yi Mu Cao is traditionally used in the postpartum period to help clear retained blood (lochia) and promote uterine recovery, it should only be used under practitioner guidance during breastfeeding. The herb's alkaloids (leonurine, stachydrine) may transfer into breast milk, but specific data on breast milk excretion is limited. The herb's slightly cold nature and blood-moving properties could theoretically affect the nursing infant's digestion. Short-term use for specific postpartum conditions under professional supervision is generally considered acceptable, but prolonged unsupervised use should be avoided.

Children

Yi Mu Cao is primarily used for gynecological conditions and has limited application in pediatric practice. When used in children for other indications (such as edema or skin conditions), dosage should be reduced proportionally based on age and body weight, typically to one-third to one-half of the adult dose. It is generally not appropriate for very young children or infants. Any pediatric use should be under the direct supervision of a qualified practitioner.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Yi Mu Cao

Anticoagulants and antiplatelet drugs (e.g. warfarin, heparin, aspirin, clopidogrel): Yi Mu Cao has demonstrated anti-platelet aggregation activity and blood-viscosity-lowering effects through its alkaloid components. Concurrent use with anticoagulant or antiplatelet medications may increase the risk of bleeding. Close monitoring of coagulation parameters is advised if co-administration is unavoidable.

Antihypertensive medications: Leonurine has vasodilatory effects and can lower blood pressure. Combined use with antihypertensive drugs may cause an additive hypotensive effect, potentially leading to dizziness, fainting, or dangerously low blood pressure.

Oxytocin and other uterotonic agents: Yi Mu Cao has ergot-like uterotonic activity. If used together with pharmaceutical uterotonic agents (such as oxytocin or methylergometrine), the combined uterine stimulating effect may be excessive, increasing the risk of uterine hyperstimulation.

Dietary Advice

Foods and dietary considerations when taking Yi Mu Cao

Because Yi Mu Cao is slightly cold in nature, it is best to avoid excessive consumption of cold, raw foods while taking it to prevent further chilling the digestive system. This is especially important for individuals with a tendency toward Spleen-Stomach cold or weakness. Warm, easily digestible, Blood-nourishing foods (such as cooked dark leafy greens, red dates, and well-cooked grains) are supportive when using this herb for menstrual or postpartum conditions. Avoid alcohol, which can intensify the herb's blood-moving effects and increase the risk of excessive bleeding.

Botanical Description

Physical characteristics and morphology of the Yi Mu Cao source plant

Leonurus japonicus Houtt. (Chinese motherwort) is an annual or biennial herbaceous plant in the Lamiaceae (mint) family. It grows from a taproot with dense fibrous rootlets, producing erect, square stems that reach 30 to 120 cm tall. The stems are marked with four longitudinal grooves and are covered with fine backward-pointing hairs, especially dense at the nodes and angles.

The leaves change shape dramatically along the stem: basal leaves are rounded and heart-shaped with shallow lobes, lower stem leaves are broadly ovate and palmately three-lobed, middle stem leaves are rhombic and deeply divided, and upper leaves near the flowers become narrow and linear. Whorled clusters of 8 to 15 stalkless flowers appear in the leaf axils. The calyx is tubular-bell-shaped (6 to 8 mm long) with triangular teeth, and the corolla is two-lipped, white to reddish-purple in color. Flowering occurs from June to September, followed by small three-angled nutlets.

The plant grows in sunny areas from sea level up to 3,400 m elevation, thriving on roadsides, field edges, wastelands, and near water. It is native to East and Southeast Asia and has naturalized widely across tropical and subtropical regions worldwide.

Sourcing & Harvesting

Where Yi Mu Cao is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Fresh herb: spring (young seedling stage) through early summer (before flowering). Dried herb: summer, when stems and leaves are lush and flowers have not yet opened or have just begun to open. Material harvested after full bloom or fruit maturation is considered lower quality.

Primary growing regions

Yi Mu Cao grows widely across nearly all provinces of China and is not strongly associated with a single 'terroir' region (道地药材) in the way that some premium herbs are. It is found throughout temperate and subtropical areas of China, from lowlands up to 3,400 m elevation. Major production areas include Henan, Anhui, Sichuan, Hubei, Jiangsu, Zhejiang, and Guangdong provinces. In southern China, especially Guangdong, fresh young Yi Mu Cao is even eaten as a vegetable. The plant also grows natively in Japan, Korea, and throughout Southeast Asia, and has naturalized in tropical and subtropical regions worldwide.

Quality indicators

Good quality dried Yi Mu Cao should have young, tender stems that are yellow-green to gray-green in color, with leaves still attached and, ideally, some flowers present. The stems should be square with four longitudinal grooves, light in weight, and somewhat pliable (not overly woody). The cross-section shows white pith in the center. Leaves should be gray-green, and the small axillary flowers should be pale purple. The aroma is faint and the taste is slightly bitter. Material that is overly mature (thick, woody stems with few leaves and abundant seeds) is considered inferior quality. The freshest, most tender herb yields the highest alkaloid content. Studies have shown that the leonurine content in stored or processed material drops significantly compared to fresh herb, so freshness is an important quality factor. Avoid material that is heavily browned, moldy, or has lost most of its leaves.

Classical Texts

Key passages from the classical Chinese medical texts that describe Yi Mu Cao and its therapeutic uses

Shen Nong Ben Cao Jing (《神农本草经》)

Original: 茺蔚子，味辛微温。主明目益精，除水气。久服轻身。茎主瘾疹痒，可作浴汤。一名益母。

Translation: Chong Wei Zi [the seed of Yi Mu Cao], acrid in flavor and slightly warm. It brightens the eyes and benefits the essence, and eliminates water-Qi. Long-term use lightens the body. The stem treats itchy skin rashes and can be made into a bath decoction. Also called Yi Mu [beneficial for mothers].

Ben Cao Hui Yan (《本草汇言》, 1624)

Original: 益母草，行血养血，行血而不伤新血，养血而不滞瘀血，诚为血家之圣药也。

Translation: Yi Mu Cao moves Blood and nourishes Blood. It moves Blood without injuring new Blood, and nourishes Blood without causing stagnation of old stasis. It is truly the supreme medicine for the Blood.

Ben Cao Zheng (《本草正》, Ming Dynasty)

Original: 益母草，性滑而利，善调女人胎产诸证，故有益母之号。然不得以其益母之名，谓妇人所必用也。盖用其滑利之性则可，求其补益之功则未也。

Translation: Yi Mu Cao is slippery and free-flowing by nature, skilled at regulating various conditions related to pregnancy and childbirth, hence the name 'beneficial for mothers.' However, one should not assume from this name that it is essential for all women's conditions. One may rely on its slippery, free-flowing nature, but should not expect tonifying or supplementing effects from it.

Historical Context

The history and evolution of Yi Mu Cao's use in Chinese medicine over the centuries

Yi Mu Cao has one of the longest documented histories of any gynecological herb in Chinese medicine. It was first recorded in the Shen Nong Ben Cao Jing (the earliest Chinese materia medica, compiled during the Han Dynasty) under the name Chong Wei (茺蔚), listed as an upper-grade herb. The name 'Yi Mu Cao' (益母草), literally meaning 'herb that benefits mothers,' reflects its central role in treating women's conditions related to menstruation, pregnancy, and postpartum recovery. The Ben Cao Gang Mu explains that the original name Chong Wei describes the plant's lush, dense growth habit (充盛密蔚).

The herb appears even earlier in Chinese literature: the Shi Jing (Book of Songs, ca. 1000-600 BCE) mentions it under the name Tui (蓷), and the Er Ya (oldest Chinese dictionary) identifies it as Huan (萑). By the Tang and Song dynasties, Yi Mu Cao had become firmly established as the foremost herb for women's blood disorders. The Ben Cao Hui Yan (1624) famously called it 'the supreme medicine for the Blood' (血家之圣药), praising its unique ability to move Blood without injuring new Blood and nourish Blood without retaining stasis. However, classical physicians also cautioned against over-reliance on its name. Zhang Jiebin in the Ben Cao Zheng warned that despite its reputation, Yi Mu Cao is fundamentally a moving, draining herb, not a tonifying one, and should not be used indiscriminately for all women's conditions. The whole plant (roots, stems, leaves, flowers) and its seeds (Chong Wei Zi / 茺蔚子) are all used medicinally, though they have somewhat different applications: the whole herb specializes in moving Blood, while the seeds have additional tonifying qualities.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Yi Mu Cao

1

Comprehensive review of leonurine pharmacology, pharmacokinetics, and toxicology (2024)

Miao LL, Zhou QM, Peng C, Liu ZH, Xiong L. Frontiers in Pharmacology, 2024, 15:1428406.

A comprehensive review of leonurine, the key alkaloid in Yi Mu Cao, covering its extraction, synthesis, pharmacokinetics, and pharmacological effects across multiple disease areas. The review documents leonurine's activities including uterine contraction, anti-inflammatory, antioxidant, anti-platelet aggregation, and cardio/cerebrovascular protective effects. It also addresses the toxicological profile, noting that therapeutic doses show no significant organ toxicity in animals, while high doses can cause renal and hepatic damage. The review notes leonurine is currently in clinical trials.

PubMed
2

Review: Leonurine as potential drug for cardiovascular and CNS diseases (2021)

Li YY, Lin YK, Liu XH, Wang L, Yu M, Li DJ, Zhu YZ, Du MR. Brain and Behavior, 2021, 11(2):e01995.

This review examined the therapeutic potential of leonurine for cardiovascular and central nervous system diseases. In atherosclerosis, leonurine reduces hypercholesterolemia through antioxidant and anti-inflammatory mechanisms. In myocardial infarction, it activates the PI3K/Akt signaling pathway and promotes myocardial contraction and angiogenesis. In depression, it alleviates symptoms by inhibiting NF-kB signaling and increasing serotonin, norepinephrine, and dopamine levels. Despite promising preclinical results, challenges of low bioavailability and poor fat solubility remain.

PubMed
3

Ethnopharmacology, phytochemistry and pharmacology of Leonurus japonicus (Review, 2014)

Shang X, Pan H, Wang X, He H, Li M. Journal of Ethnopharmacology, 2014, 152(1):14-32.

A comprehensive review documenting the ethnopharmacological uses, phytochemistry, and modern pharmacological evidence for Leonurus japonicus. The paper catalogs the herb's chemical constituents (alkaloids, diterpenes, flavonoids, volatile oils, cyclic peptides) and summarizes evidence for its traditional uses in gynecological disorders, as well as emerging evidence for cardiovascular protection, anti-inflammatory, and antitumor activities.

PubMed
4

HPLC study on leonurine content in Leonurus japonicus vs. L. cardiaca (2012)

Kuchta K, Ortwein J, Rauwald HW. Pharmazie, 2012, 67(12):973-979.

This study developed an HPLC method to measure leonurine across different Leonurus species. It found that leonurine is present in the aerial parts of L. japonicus (Chinese motherwort) at 0.001-0.049% in commercial samples, and higher (at least 0.1%) in domestically cultivated material. Importantly, no leonurine was detected in any samples of L. cardiaca (European motherwort), demonstrating these two species are pharmacologically distinct. The seeds of L. japonicus also contained no leonurine.

PubMed

Research on individual TCM herbs is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.